there was a little bit of a back and forth between gingrich and romney. and of course, gingrich, never one to hold his tongue, had some choice words for romney, didn't he? >> reporter: he sure did. he was on "the situation room" yesterday. and of course gingrich and romney battled it out earlier this year, along with others, for the nomination. well, gingrich gave some advice on what's maybe not working for romney. take a listen. >> the romney campaign has yet to find a thematic way of explaining itself and laying out in a clear, crisp way the difference between romney and obama. it's clearly something you can go out and you can communicate and you can do dramatically better than romney's currently doing. >> just be who you are. others say, get tougher, attack. and my own view is this. i've got to be who i am and describe why i think i'm the person that's going to become the next president of the united states, and how my policies will make life better for american families. >> reporter: mitt romney getting a lot of advice right now, just six days away fr